The Black Kestrel
Explorer
In PL 6+ games I think both energy and ballistic weapons are viable. The choice to use them will be mission specific. I'd much prefer an energy weapon which has minimal or no recoil when conducting operations on a low or zero-gee enviroment. On the other hand a ballistic weapon would be much more appropiate when underwater. Admittedly these are extremes of the enviromental spectrum and wouldn't be the only factors in a decision to use ballistic or energy weapons. Questions of mass, shot capacity, logistics (find more bullets or an energy source), maintenance, cost, payload capabilities etc will drive the decision as much as anything else.
Application is another area where ballistic or energy weapons could dominate. Consider for a moment anti-missile/artillery/mortar systems. While there are ballistic (SKYGUARD, ARROW etc.) systems designed to counter the threat currently, energy weapons with their inherently superior speed (accuracy is variable based on atmospheric conditions) could possible be a better choice especially if they guard a fixed site where power is plentiful and maintenance regular.
Application is another area where ballistic or energy weapons could dominate. Consider for a moment anti-missile/artillery/mortar systems. While there are ballistic (SKYGUARD, ARROW etc.) systems designed to counter the threat currently, energy weapons with their inherently superior speed (accuracy is variable based on atmospheric conditions) could possible be a better choice especially if they guard a fixed site where power is plentiful and maintenance regular.